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Doctoral Thes...Ma Magaia.Pdf Chemical analysis to promote the use of wild fruits from Mozambique Magaia, Telma 2015 Link to publication Citation for published version (APA): Magaia, T. (2015). Chemical analysis to promote the use of wild fruits from Mozambique. Lund University. Total number of authors: 1 General rights Unless other specific re-use rights are stated the following general rights apply: Copyright and moral rights for the publications made accessible in the public portal are retained by the authors and/or other copyright owners and it is a condition of accessing publications that users recognise and abide by the legal requirements associated with these rights. • Users may download and print one copy of any publication from the public portal for the purpose of private study or research. • You may not further distribute the material or use it for any profit-making activity or commercial gain • You may freely distribute the URL identifying the publication in the public portal Read more about Creative commons licenses: https://creativecommons.org/licenses/ Take down policy If you believe that this document breaches copyright please contact us providing details, and we will remove access to the work immediately and investigate your claim. LUND UNIVERSITY PO Box 117 221 00 Lund +46 46-222 00 00 Chemical Analysis to promote the use of Wild Fruits from Mozambique DEPARTMENT OF FOOD TECHNOLOGY, ENGINEERING & NUTRITION | LUND UNIVERSITY TELMA MAGAIA Chemical Analysis to promote the use of Wild Fruits from Mozambique Telma Magaia 2015 Doctoral thesis which, by due permission of the Faculty of Engineering at Lund University, will be publicly defended at the Center for Chemistry and Chemical Engineering on Thursday September 3rd 2015 at 10.15 a.m. in Lecture Hall B. Faculty opponent Professor Mehari Gebre-Medhin, Uppsala University Hospital, Sweden Organization Document name LUND UNIVERSITY DOCTORAL DISSERTATION Department of Food Technology, Engineering and Date of issue 2015-09-03 Nutrition. P.O. Box 124, SE-22100 Lund, Sweden Author Telma Magaia Sponsoring organization Swedish International Development Cooperation Agency (SIDA) Title and subtitle Chemical Analysis to promote the use of Wild Fruits from Mozambique Abstract Wild fruit trees have significant cultural and socio-economic value in rural areas of Mozambique. Most of the wild fruits are seasonal and are available mainly in the wet season. Generally they have a short shelf-life and are eaten fresh or after minimal processing; the most common method of preservation is sun-drying. The fruits of Adansonia digitata, Landolphia kirkii, Salacia kraussii, Sclerocarya birrea, and Vangueria infausta were selected for this study. New data on nutritional components and other characteristics have been obtained. The pH, titratable acidity and the content of soluble solids in the fruit pulps were determined. The organic acids citric, malic and succinic acids were found at various amounts in all pulps. The contents of different mono- and disaccharides were also analysed in the pulps. The protein content was low in all the fruit pulps, as is the case in fruits in general. However, the protein content was high in the kernels of A. digitata and S. birrea, about 30 to 40% on dry matter basis. The total co ntent and relative amounts of the different essential amino acids are with a few exceptions similar to or above that recommended by the WHO for children aged 3 to10 years. The fat content was below 2% in the fruit pulps, while the fat content in A. digitata kernels was almost 40%, and S. birrea kernels about 60%. The kernels of A. digitata and S. birrea are rich in unsaturated fatty acids, and constituted about 68 and 80%, respectively, of the total fat. The A. digitata kernels contained appreciable amounts of essential fatty acids; the amount of linoleic was about 30% and linolenic acid 2%. S. birrea kernels contained about 7% linoleic acid. The fruits contained both insoluble and soluble dietary fibre. The pulp of A. digitata had the highest amount of soluble dietary fibre, around 60% (on dry matter ba sis), while V. infausta pulp had the highest amount of insoluble dietary fibre, around 40%. The kernels contained 3 to 5% phytic acid which may decrease the absorption of minerals. Treatment with phytase reduced the phytic acid cont ent by 20 to 30% after only 15 minutes enzymatic in cubation. Interestingly, almost 50% of the estimated original content of minerals was found in the supernatant after a few minutes’ enzyme incubation. The amount of iron in the pulps ranged from 1 to 9 mg/100 g (on dry matter basis); the highest amount being observed in S. kraussii. The highest iron content, 29 g/100 g DM, was foun d in whole seeds of A. digitata, 29 mg iron/100 g. The A. digitata pulp contained an appreciable amount of calcium, and the kernel also had high content of calcium. In conclusion, data from this study can be used to encourage the increased consumption of these wild f ruits and kernels. In addition, the results of the analysis of the investigated fruits can form the basis for the selection of fruits for wider use, domestication, and processing to extend their shelf-life and for the manufacture of other food products. Key words: pulps, kernels, consumption, fat, protein, minerals, dietary fibre Classification system and/or index terms (if any) Supplementary bibliographical information Language English ISSN and key title ISBN 978-91-7422-406-1 Recipient’s notes Number of pages 140 Price Security classification I, the undersigned, being the copyright owner of the abstract of the above-mentioned dissertation, hereby grant to all reference sources permission to publish and disseminate the abstract of the above-mentioned dissertation. Signature ____________________________________ Date_______________________ Chemical Analysis to promote the use of Wild Fruits from Mozambique Telma Magaia 2015 Maputo-Moçambique Cover photo: Landscape in the Changara district in Mozambique. FrontBack cover: photo: Artistic A basket representation with wild fruits of selectedtwo strands for theof study.the TQ1 polymer with truncated alkyl side-chains and with hydrogen atoms not shown. © Alice Hedström Back cover: Artistic representation of the PC61BM molecule with hydrogen atoms not shown. © Alice Hedström Doctoral thesis: “Computational Predictions of Conjugated Polymer Properties for Photovoltaic Applications” © Svante Hedström, 2015 Division of Theoretical Chemistry Lund University P. O. Box 124 S-221 00 Lund Sweden [email protected] Copyright Telma Magaia* *Full Name: Telma dos Anjos Leví Jamisse Magaia Department of Food Technology, Engineering and Nutrition DepartmentFaculty of ofEngineering, Chemistry, FacultyLund University of Science Lund University ISBN:ISBN 978-91-7422-405-4 978-91-7422-406-1 PrintedPrinted in inSweden Sweden by byMedi Media-Tryck,a-Tryck, Lund Lund University University LundLund 2015 2015 ii “There are many people who can do big things, but there are very few people who will do the small things.” MotherTeresa “Há muitas pessoas que podem fazer grandes coisas. Mas há muito poucas pessoas que farão as pequenas coisas.” Madre Teresa de Calcutá Abstract Wild fruit trees have significant cultural and socio-economic value in rural areas of Mozambique. Most of the wild fruits are seasonal and are available mainly in the wet season. Generally they have a short shelf-life and are eaten fresh or after minimal processing; the most common method of preservation is sun-drying. The fruits of Adansonia digitata, Landolphia kirkii, Salacia kraussii, Sclerocarya birrea, and Vangueria infausta were selected for this study. These fruits are the most popular, and are consumed in different districts of Mozambique, especially by children, and form part of their normal diet. Besides from eaten fresh, the fruits are mixed with sugar, pressed to make juice, as jam or a kind of dessert, and the pulp and sometimes the kernels are dried and used as flour to make porridge or a sauce. New data on nutritional components and other characteristics have been obtained. The pH, titratable acidity and the content of soluble solids in the fruit pulps were determined as these are of importance for the fruit processing industry. The pulp of all the fruits except S. kraussii had an acidic character. The organic acids citric, malic and succinic acids were found at various amounts in all pulps. The highest amounts of citric acid were found in A. digitata and L. kirkii; above 20 g/kg. Organic acids are responsible for many characteristic fruity tastes and may enhance the absorption of minerals. The contents of different mono- and disaccharides were also analysed in the pulps. The highest amounts of glucose (7.5%) and fructose (5.7%) were found in L. kirkii, while A. digitata contained the highest amount of sucrose (4.3%). The protein content was low in all the fruit pulps, as is the case in fruits in general. However, the protein content was high in the kernels of A. digitata and S. birrea, about 30 to 40% on dry matter basis. For children aged 4 to 8 years, around 80 and 67% of the adequate intake (AI) (defined by the Food and Nutrition Board of the US Institute of Medicine) could be covered by the consumption of 40 g A. digitata kernels or S. birrea kernels, respectively. The total content and relative amounts of the different essential amino acids are with a few exceptions similar to or above that recommended by the WHO for children aged 3 to10 years. The fat content was below 2% in the fruit pulps, while the fat content in A. digitata kernels was almost 40%, and S. birrea kernels about 60%. The kernels of A. digitata and S. birrea are rich in unsaturated fatty acids, and constituted about 68 and 80%, respectively, of the total fat. The A. digitata kernels contained appreciable amounts of essential fatty acids; the amount of linoleic was about 30% and linolenic acid 2%.
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